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インストールされたデバイスについての詳細情報の獲得方法
[WinPcap 入門編]


 レッスン1(デバイスリストの獲得方法) は、有効なアダプタについての基本的な情報(デバイスの名前と詳細)の獲得方法を示していました。実際、WinPcapha 他の詳細な情報についても提供します。特にpcap_findalldevs()関 数によって返された全てのpcap_if 構造体は pcap_addr 構造体のリストをも、下記の情報と共に包含しています。

 続く下記のサンプルは、pcap_if 構造体の内容全てを表示する関数ifpring()を備えています。この関数は、pcap_findalldevs()によって返された全てのエントリに よって呼び出されます。

/*
 * Copyright (c) 1999 - 2002
 *  Politecnico di Torino.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the Politecnico
 * di Torino, and its contributors.'' Neither the name of
 * the University nor the names of its contributors may be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#include "pcap.h"
#ifndef WIN32
#include <sys/socket.h>
#include <netinet/in.h>
#else
#include <winsock.h>
#endif

void ifprint(pcap_if_t *d);
char *iptos(u_long in);

int main()
{
pcap_if_t *alldevs;
pcap_if_t *d;
char errbuf[PCAP_ERRBUF_SIZE+1];

/* Retrieve the interfaces list */ if (pcap_findalldevs(&alldevs, errbuf) == -1)
{
fprintf(stderr,"Error in pcap_findalldevs: %s\n",errbuf);
exit(1);
}

/* Scan the list printing every entry */ for(d=alldevs;d;d=d->next)
{
ifprint(d);
}

return 1;
}

/* Print all the available information on the given interface */ void ifprint(pcap_if_t *d)
{
pcap_addr_t *a;

/* Name */ printf("%s\n",d->name);

/* Description */ if (d->description)
printf("\tDescription: %s\n",d->description);

/* Loopback Address*/ printf("\tLoopback: %s\n",(d->flags & PCAP_IF_LOOPBACK)?"yes":"no");

/* IP addresses */ for(a=d->addresses;a;a=a->next) {
printf("\tAddress Family: #%d\n",a->addr->sa_family);

switch(a->addr->sa_family)
{
case AF_INET:
printf("\tAddress Family Name: AF_INET\n");
if (a->addr)
printf("\tAddress: %s\n",iptos(((struct sockaddr_in *)a->addr)->sin_addr.s_addr));
if (a->netmask)
printf("\tNetmask: %s\n",iptos(((struct sockaddr_in *)a->netmask)->sin_addr.s_addr));
if (a->broadaddr)
printf("\tBroadcast Address: %s\n",iptos(((struct sockaddr_in *)a->broadaddr)->sin_addr.s_addr));
if (a->dstaddr)
printf("\tDestination Address: %s\n",iptos(((struct sockaddr_in *)a->dstaddr)->sin_addr.s_addr));
break;
default:
printf("\tAddress Family Name: Unknown\n");
break;
}
}
printf("\n");
}

/* From tcptraceroute, convert a numeric IP address to a string */ #define IPTOSBUFFERS 12 char *iptos(u_long in)
{
static char output[IPTOSBUFFERS][3*4+3+1];
static short which;
u_char *p;

p = (u_char *)&in;
which = (which + 1 == IPTOSBUFFERS ? 0 : which + 1);
sprintf(output[which], "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
return output[which];
}

documentation. Copyright (c)2002-2003 Politecnico di Torino.
2005 translated by Telebusiness,Inc.
 All rights reserved.